Merge several PDF documents into one document

private void mergeFiles(PDFLibrary mergePDF, string drawingPath, string finalPDF, int pagePosition)

// Load the document that you will extract the pages from

mergePDF.LoadFromFile(drawingPath, "");

// Get the ID for the mergePDF document

int docID1 = mergePDF.SelectedDocument();

// Load the document that you will insert the extracted pages into

mergePDF.LoadFromFile(txtFile.Text, "");

// Get the ID for the origPDF document

int docID2 = mergePDF.SelectedDocument();

// Count the number of pages in the destination document

int tPages2 = mergePDF.PageCount();

// Copy pages from source document to the destination document

mergePDF.CopyPageRanges(docID1, "1");

// Again count the number of pages in the destination document

int tPages1 = mergePDF.PageCount();

// Get the total number of pages added to the destination document

int tPages3 = tPages1 - tPages2;

// Specify the page number that the new pages should be inserted at

int NewPagePos = pagePosition + 1;

// Loop through each insert page and move it to the correct location

while (tPages3 > 0)

// We always move the last page

// in the document until all

// insert pages have been moved.

mergePDF.SelectPage(mergePDF.PageCount());

mergePDF.MovePage(NewPagePos);

// Increase location of next page. So if

// first page is inserted at page number 2,

// then next page will be inserted at page number 3

NewPagePos++;

// Decrease number of pages left to process

tPages3--;

mergePDF.SaveToFile(finalPDF);

// Load the first pdf

pdfDoc.LoadFromFile(finalPDF, "");

int PrimaryDoc = pdfDoc.SelectedDocument();

// Load the second pdf

pdfDoc.LoadFromFile(tempJobFile, "");

After the second LoadFromFile all things from the finalPDF are lost.

Please ONE LoadFromFile for ONE instance.

And again: Please have a look into the samples and the developer guide.

private void mergeJobAndDrawings(string tempJobFile, int counter)

PDFLibrary pdf1 = newPdf();

// Final document containing the Job and the Drawing

var desktopFolder = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);

var FinalPDF = Path.Combine(desktopFolder, "FinalPDF.pdf");

// Load the first pdf

pdf1.LoadFromFile(FinalPDF, "");

//pdf.SaveToFile(finalPDF);

int PrimaryDoc = pdf1.SelectedDocument();

// Load the second pdf

pdf1.LoadFromFile(tempJobFile, "");

int SecondaryDoc = pdf1.SelectedDocument();

// Select the first document

pdf1.SelectDocument(PrimaryDoc);

// Merge the second document with the

// previously selected document.

pdf1.MergeDocument(SecondaryDoc);

// Save the merged document to disk

if (pdf1.SaveToFile(FinalPDF) == 1)

//MessageBox.Show("Merge Successful");

else

MessageBox.Show("Merge Not Successful" + " " + partNumbers[counter] + " " + pagePosition[counter]);

pdf1.ReleaseLibrary();